I Remember My First Painful Breakup [Painful Breakups]

This girl and I have been going out since primary school. I moved onto high school and made a pact that if she went to the same high school we would continue our relationship. I finished primary school a year before her and had a tearful goodbye. Then I got the phone call saying she was going to be at my high school I told her I had not been with anyone at all that year and she said the same. We reconnected like nothing had happened and after a while she explained how a boy in her grade had just been dumped and had asked her out. She was asking my permission to go out with him of course I told her no. The next day there was a rumor going around school that she had gone out with him. I confronted her and she denied it. It turns out she was a lying piece of shit and had gone out with him and I broke up with her that afternoon.